SEATTLE -- A crowd of 45,000 fans got an extra surprise at the end of the Paul McCartney concert at Safeco Field, when members of Nirvana joined him on stage.

It's not the first time Sir Paul & Nirvana have collaborated. They also played together during the December 2012 Hurricane Sandy relief concert.

The event was the first-ever public concert at Safeco Field.

It took 250 people, 31 trucks of gear and 70,000 watts of audio equipment to get the stadium ready for the show and the crowds that came with it. The preparation work included laying down a protective surface to protect the field from forklifts and other machinery setting up the stage in center field.

Fans told KING 5 they'd go just about anywhere to see Sir Paul perform, but the setting made this show even more of a must-see.

It's such a beautiful Seattle day, said Judy Qualls. And we get to see a legend.

After the concert, crews will work through the weekend, removing everything and preparing for the Monday night Mariners game.

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